for 87-93 the factory sizes are 3 1/2 for the dash, 6 1/2 for the doors, and 5x7's in the rear. u can also check the specs yourself by looking at a crutchfield catolage or going ot their web site.
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89 GT AOD w/ shift kit, B&M rachet shifter, Trickflow intake, Crane (E-type) cam, 70Tb, 75MAF, 1.6 Rockers, Pulleys, MAC headers and H-pipe, Dynomax mufflers, K&N, 3 core radiator, white face gauges, custom interior, cobra R rims
MY89GT